Robotic snow removal in Delaware: few storms, mostly wet ones

Delaware doesn’t get much snow, and the snow it gets is the worst kind. That’s the whole state in a sentence, and it shapes how we set up a robot here. Zippy PA & DE covers New Castle County and points south; Zippy Delmarva works the peninsula. Here’s the honest picture.

How much snow

Average annual snowfall (NOAA 1991–2020 normals):

Area	Average snowfall	Notes
Wilmington	20 in	About 5 days a year with an inch or more; 2 days with 3 or more
Newark / Middletown	15–20 in	No official station; sits between Wilmington and Dover
Dover	13 in	About 5 snow days a year
Milford	13 in
Lewes / Rehoboth / Sussex coast	10–11 in	Nor’easters bring snow or rain, plus coastal flooding

Local contractors plan on roughly six to eight plowable events in a normal season, and some seasons deliver two.

Then there are the other seasons. February 2010 gave Bear, in New Castle County, nearly 47 inches in a month and a state-record 73 inches for the winter. The January 2016 blizzard dropped 16 inches on Wilmington and 14 on Dover. The January 2026 storm brought 10 inches to Bear and 8 to Wilmington as snow, sleet, and ice, and a February blizzard set a daily record at the airport a month later.

Why the snow here is heavy

Delaware sits on the rain/snow line for nearly every coastal storm. Temperatures hover near freezing, so what falls is dense, wet, and often mixed with sleet — the stuff that makes a shovel feel like it’s full of wet sand. The gradient is sharp: in the same 2016 storm, southern Delaware got half of what Wilmington got.

For a robot, that’s the timing game: clear early, clear often, never let six inches of slush become six inches of slush. It also means freezing rain and refreeze days are part of the plan, and de-icing stays a human job.

Who plows your street (it’s probably DelDOT)

Delaware is one of only a few states where the state maintains nearly the entire road network — about 90 percent of it, including a great many subdivision streets. Two consequences for homeowners:

• DelDOT plows state-maintained subdivision streets only after several inches, and not at all in communities that take the state’s snow-removal reimbursement, which pays a large share of a community’s private contractor. Private subdivisions, which are most of them in Sussex, get no state plowing; the HOA hires it.
• DelDOT does not plow driveways and won’t clear the berm it leaves across yours.

So Delaware driveways often see a later plow than a Pennsylvania street would, and the apron berm arrives late and refrozen. We time an apron pass for it. DelDOT also pre-treats with brine, which turns light snow into salty slush; the robot’s intake and throw are set for it.

Sidewalk deadlines

Deadlines after snowfall ends, from municipal codes and city notices:

Municipality	Deadline	Notes
Wilmington	24 hours	City urges a 36-inch path within 6 hours; no snow into gutters or roadway
Newark	24 hours	City clears and bills the cost plus a 50 percent surcharge
Dover	24 hours	Changed from 12 hours in 2025; $50 per violation, no warning
Middletown	24 hours	Each day is a separate offense; senior shoveling program exists
New Castle (city)	24 hours	At least 3 feet, to the gutter
Lewes	24 hours
Ellendale	2 hours	Yes, two

Rehoboth Beach and Milford didn’t have a clear published deadline when we checked; call the town office. Everywhere, keep the snow on your property and off the street — that’s a throw-zone rule for us.

HOAs

New Castle County subdivisions are HOA country, and the HOA usually contracts the street plowing. That contract does not cover your driveway or walk, and it usually runs on a 2- to 4-inch trigger with completion hours after the storm. A robot clears the driveway and walk regardless of when the HOA’s truck arrives, and quiet mode handles the overnight hours; here’s the noise question.

Honest math for a low-snow state

We say this plainly in the cost post: where a season has six storms, a robot takes longer to pay back on plow-contract savings than it does in Erie or Boulder. What tilts it in Delaware is that those six storms are the heavy, hospital-visit kind, that the same Core mows in the summer, and that the fully managed plan makes it a service fee rather than a purchase.

A note on incentives: Delmarva Power’s instant discounts on electric outdoor equipment, including snow blowers, are funded by Maryland’s EmPOWER program and apply at Maryland retailers, not Delaware ones. We didn’t find a Delaware equivalent as of this writing.

Your crew

New Castle County and northern Delaware: Zippy PA & DE, 410-725-7500, [email protected]. Kent and Sussex: Zippy Delmarva, 410-226-6705, [email protected]. Or trace your driveway from satellite and we’ll tell you honestly whether it’s a fit.